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Snow

Ported to Coracle from www.dwitter.net/d/26605

import coracle.Colour
import coracle.Drawing
import coracle.Math.map
import kotlin.math.cos
import kotlin.math.pow

/*
    Adapted from https://www.dwitter.net/d/26605
*/
class SnowDrawing: Drawing() {
    val count = 800
    val bg = Colour(0x1d1d1d)
    val white = Colour(0xffffff)
    override fun setup() {
        size(700, 500)
        noStroke()
    }

    override fun draw() {
        background(bg)

        val t = frame/100.0

        repeat(count){ i ->

            val x = ((i.toFloat().pow(3)) % 32) - 16 + cos(i + t * 2.0)
            val y = ((((i.toFloat().pow(3)) % 23) + t * 2) % 13) - 9
            val z = i/180.0

            val alpha2 = map(i.toFloat(), 0f, count.toFloat(), 1f, 0.3f)
            fill(white, alpha2)

            val r = map(i.toFloat(), 0f, count.toFloat(), 15f, 1f).toInt()
            val wX = (width/2) + 100 * (x/z)
            val wY = (height/1.5) + 200 * (y/z)
            if (wX >= r && wX <= width + r && wY >= -r && wY <= height + r) {
                circle(wX, wY, r)
            }

        }
    }
}